inspector: Fix the monitor list width

Fixes #2909
9 jobs for matthiasc/for-master in 43 minutes and 13 seconds (queued for 1 second)
Status Job ID Name Coverage
  .Pre
passed #793272
style-check-diff

00:03:32

 
  Build
passed #793273
fedora-x86_64

00:08:25

passed #793275
win32-ps
msys2-mingw64

00:03:26

passed #793274
release-build

00:11:22

 
  Analysis
passed #793276
static-scan

00:19:23

 
  Docs
passed #793277
reference

00:08:54

 
  Flatpak
manual #793278
flatpak allowed to fail manual
flatpak-manual:demo
manual #793280
flatpak allowed to fail manual
flatpak-manual:icon-browser
manual #793279
flatpak allowed to fail manual
flatpak-manual:widget-factory